地下通道开挖对邻近条形基础的影响

发布时间：2018-06-09 16:48

本文选题：隧道开挖 + 地表沉降　；参考：《上海大学》2015年硕士论文

【摘要】：随着城市交通事业的蓬勃发展,地下隧道工程日益增多。由于城市环境的复杂性,地下通道施工经常会出现邻近或穿越密集建筑群的情况,若不及时采取正确的保护措施,建筑物的安全和正常使用将受到威胁。因此,研究地下通道施工对地表建筑物的影响是非常必要的。本文结合上海市外滩隧道工程福州路至天潼路区段邻近或穿越地表建筑物的工程实际,采用理论分析和数值模拟相结合的方法,研究了地下通道开挖过程中对邻近条形基础的影响,主要研究内容和成果如下:1.通过数值模拟和理论分析,研究了地下通道开挖过程中影响邻近条形基础变形的因素,包括:条形基础到地下通道纵向中心轴线的距离、通道埋深、通道直径、支护刚度以及土层特性等,并提出了地下通道开挖过程中与条形基础之间安全距离的估算方法,为确定合理的隧道直径、平面布置、埋深以及支护措施等提供参考。2.探讨了荷载作用下地表沉降受既有隧道的影响规律及布辛奈斯克公式在非连续弹性土体中的适用性。3.根据基于非等量径向土体移动模式估算的隧道开挖引起土体自由场位移解析解和半空间内任意点处由隧道开挖引起的应力和位移弹性力学解答,推导了地下通道开挖引起顶部条形基础变形的计算公式。同时还得到了既有条形基础在地下通道开挖过程中,对土体运动的影响规律。
[Abstract]:With the vigorous development of urban transportation, underground tunnel engineering is increasing day by day. Due to the complexity of urban environment, the construction of underground passage often occurs in the vicinity or through the dense buildings. If the correct protection measures are not taken in time, the safety and normal use of buildings will be threatened. Therefore, it is necessary to study the influence of underground tunnel construction on surface buildings. Based on the engineering practice of the section from Fuzhou Road to Tiantong Road in Shanghai Bund Tunnel Project, this paper adopts the method of combining theoretical analysis and numerical simulation. The influence of underground tunnel excavation on adjacent strip foundation is studied. The main contents and results are as follows: 1. Through numerical simulation and theoretical analysis, the factors influencing the deformation of adjacent strip foundation during the excavation of underground tunnel are studied, including: distance from strip foundation to longitudinal axis of underground passage, tunnel depth, channel diameter, The method of estimating the safe distance between the underground tunnel and the strip foundation during excavation is put forward, which provides a reference for determining the reasonable tunnel diameter, plane layout, buried depth and supporting measures. The influence of existing tunnels on surface settlement under load and the applicability of Bushinesk formula in discontinuous elastic soil are discussed. According to the analytical solution of the free field displacement of soil caused by tunnel excavation and the elastic solution of stress and displacement caused by tunnel excavation at any point in the half-space based on the estimation of non-equal radial soil movement model. The calculation formula of the deformation of the top strip foundation caused by the excavation of the underground passage is derived. At the same time, the influence of the existing strip foundation on the soil movement during the excavation of the underground tunnel is obtained.
【学位授予单位】：上海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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